Device for paper feed rollers



July 27, 194 J. F. s. IIDE ALBUQUERQUE 2,325,234

DEVICE FOR PAPER FEED ROLLERS Filed April 15, 1940 2 Sheets-Sheet 1 11 ,ifiaveitfol? I July 27, 1943. J. F. s. DE ALBUQUERQUE 4 DEVICE FOR PAPER FEED ROLLERS Filed April is, 1940 2 Sheets-Sheet 2 mini; SJ E6. De Azuguer q ue Patented July 27, 1943 NT] I DEYICE FOR PAPER FEED ROLLERS Jos Figueira Saboia do Albuquerque,

Rio de Janeiro, Brazil Application April 15, 1940, Serial No. 329,805 v17 Claims. (01. 197-141) This application is a continuation-in-part of applicants co-pending application Serial No. 151,584, filed July'2; 1937. V I

This invention relates to a device for automaticahy locking, against further rotation and at a predetermined moment regulated at will by the operator, the paper-feed-roller or platen of a type-Writing machine, tabulating machine or rollers of any other machines to which the apparatus may be applicable.

Although present day typewriters are quiet perfect, they do not however incorporate a device which will avoid the operator paying close attention to the moment when the typing reaches the bottom or near the bottom of the paper and it thus frequently happens that the written'sheet is not firmly held in the typewriter at the bottom so that the last-line is written obliquely. Should it be a statement that is being typewritten or tabulated, the work'will often have to be repeated, as by a slight oversight, sufficient space may not have been left for the filling in of totals, etc. The chief aim of the present invention is to af-- ford a device for mechanically avoiding that a paper sheet which is in use in a typewriting machine, tabulating machine-or the like, be unexpectedly released from the platen thus preserving a margin at the bottom ofthe sheet, the device being comprised of the combination of a locking mechanism, withthe platen and with a reference mark situated on the carriage mom a fixed part of the machine, with which the bottom edge of the sheet will have to initially be made to coincide, and being manipulated througha special method. In this device, the essence-of the invention rests in the process of relationing the displacements of the bottom edge of a paper sheet, resulting from the rotation" of theplaten in a typewriter and the like, with the reciprocal displacements of the members of 'a 'locking mecha nism operatively connectable to the platen in such a way that the platen is locked when the typing reaches a predetermined position near the sheets bottom edge. Locking the platen warns the operator that the sheet is about to be released further typing being possible only by disengaging the locking mechanism from the platen by means of a device afforded for'thispurpose.

Further objects will be apparent from the fol-'- lcwing description'taken in connection with the accompanying drawings in which& r

Figure 1 is an exploded axial sectional View of the locking mechanism, 1

Figure 2 is a plan view of the. guide member,

carriage,

' Figure '7 is a plan view of the'locking mecha- Figure 3 is a side view of the actuating screw member, f -Figure 4 is an inside view of the coupling member which acts simultaneously as turning knob, l Figure 5 is a plan view of the'stub shaft,

Figure 6 is'an axial sectional View of the lock-' ing mechanism mounted on the platen shaft and nism,

mechanism taken on line 88 of Fig.6,

- Figure 9 is a plan view of a typewriter with the locking mechanism attached to the platen, and

Figure 10 is a perspective view of the ring with the reference marks thereon. 1

The, locking mechanism, Fig. 7, according to this invention is mounted on the axle 26 of the platen 25 by means of a'stub shaft 8 into which the. axle 26 projects and the shaft is locked thereon against rotation by means'of the set screw 23 projecting into a perforation in the'axle; The shaft 8 has a circumferential groove 9 therein, a T-shaped groove l0 and a perforation ll, Fig. 5.

A cylindrical guide '2 cooperates with an actuating screw member 4 which latter' is rotatably mounted on the shaft 8 and is rotatably held thereon by means of the screw or pin [2 which projects into the groove 9.

The guideZ is secured to the carriage frame member i 3 on the side; face 33 of the latter-by means of screws 84 passing through the flange i5 and into the member 13. A nut l, which is threaded on the screw-threaded portion IB- of the actuating member 4, Fig. 6, holds the member l securely in position relative to the member 2, and

turns together with the screw member.

On the end of the stub'shaft 8 there is mounted a turning knob or coupling memberS which ha'sa' part axial and apart rotary movement gove'rned by the screw or pin l8 which projects into the T-shaped slot it). A retaining ring 1 isheld in place by means of a set screw 20 which latter projects into the perforation N, Fig. 5, in the stub shaft 8.- A spring 6 between the ring 1 and the coupling member 5 V constantly urges the member 5-to the left, Fig. 6-.

The locking mechanism also includes a lock 'ring nut 3 threaded on the screw-threaded portion it having a projecting pin or screw 2| which latter projects in the slot 22 ,in the cylindrical guide 2, Figs. '1 and 6, and is guided therein to prevent rotation of the lock ring 3 but will permit axial displacement thereof upon rotation of the actuating member 4. Thejlock ring nut'3 is pro- Figure 8 is a cross sectional view'of the lockingvided with a pointer element 24 mounted thereon by means of the screw 2| and which is adapted to cooperate with a marking line or graduation 21, which last is engraved on a small detachable plate 42 which may be placed in a suitable position on the guide member and fixed thereon face 3| of the actuating screw member 4. The

pin l8 cooperates with T-shaped slot l and the turning knob member 5 will rotate the platen 25 by means of the stub shaft ,8 or upon. rotation of the platen upon reaching the end of a line when typing, the stub shaft 8 will rotate the turning knob member 5 together with the actuating screw 1 member 4 by means of a perforation 29 and the pin [1, when the pin I8 is in the leg groove 32. If, however, the turning knob member is pulled. to the right, Fig.6, the pin 18 reaches and co.- operates. with the head groove 33 which. also maintains; a;v rotary cooperation. with the stub shaft 3: but the rotaryconnection between the member 5 and member 4: is broken'since the pin M: is; notpzojecting. in anyone: of. the perforations 29. i

actuating screw member 4' is also provided with a ring 39 supporting a series of graduations Ii (=1; 2,3); Theagraduations. or reference marks numbered, 1., 2;. 3; are'so arranged: and placed (the ring; permits the definite: fixing of said. marks in one. suitable position on the cylindrical surface it as: to permit locking. of the platen, if the device is used according to the instructions of this: specification, at a moment when by disengaging; the locking mechanism, one, two, three, lines-,accordi'ngto whether reference 31: has been made to:- coincide with markings 1,. 2 or 3, may still. be. typedupon the sheet before. the pre'-' cise moment when. this last is. released from. the paperfeed roller. 'Ifhe ring, 39- is; fixed in the correct. position,- on. the cylindrical surface. 4|- of the? actuating: screw member by means of a small screw, threaded toring 39;.

The: locking; mechanism consists primarily of the actuating screw member 4 and the lock ring3 threaded thereon. Member 4 has a free rotary movement'onshaft 3, whereas ring. 3 will only have possible travel along the course; of the screw threaded portion: It, along the longitudinal-slot 22 in which the ring, is guided so that upon,rota-.

tion of the member 4-,, the ring 3: not being able to rotateat the-same time, must necessarilytravel along the screwthreaded. portion l6-.. .W-hen: the

ring 3 has travelledithe-full length of'the portion l5.- it: encounters a radial abutment surface formed: upon the actuating screw member; that is,

theheadof the; actuating screw member-,;which is thus impeded-of further movement since said screw memberand lock" ring at this momentrform amnit and theloclrring3 cannot, by. construction, rotate- Thus the: member 4: islccked; against rotation-,as is also the shaft 26 of the roller or platen; of the-machine;

It is evident that the number of rotations and its fractions the member 41 can complete before becoming. locked, willndepend' on the distance of the'lock; ring: 3 from the end: of its course along the screwthreaded; portion 13, and this distance can: be; regulated at will by the operator in cooperation with a determined distance which must bei covered: by thebottom-edge of the sheet from a manic or point 35,: Fig; 9, conveniently chosen nism may be adapted to lock the actuating screw member and, consequently the platen, both when the lock ring 3. encounters the head of the screw member 4. or the nut I placed at said screws other extremity, or in other words, whatever the direction of displacement of said lock ring 3 along the .screw' member 4,. or wherever the locking mechanism is placed at the right or left side of the machine carriage.

The device operate as follows:

The sheet ofpap'er isplaced in the machin in the usual manner but thebottom of. the sheet is brought down by-continued rotation. of. the platen 2-5: until the'bottom edgeof the sheet coincides witha reference or guideline 35 on-the paper guide 36- of the machine, Fig. 9-, any other suitable line or. guide; means may be-used, it being immaterial as to its-location provided that reference marks 34, 31 and 21.- beplaced. conveniently to collaborate with-mark 35, ling-,9, previously selected as theinitial position ofthe sheets bottom edge. g I

. Themarking line. 2:l=, 31 'andthe lines or marks 34 (1, 2, and 3) Fig. 7, cooper.ate with the line 35 for the sheets bottom edge initial position which should always be thesame at the time of connecting the device. For this position of the paper, the pointer 24,. indicating the position of lock ring 3, is placed in alignment with the mark 21 by turning the: actuating member 4,.the coupling member 5: having been previously disconnected by pulling the member 5 to the right, Fig. 6, to disengage the pin. H- from one of the perforations 23. When pointer-24 is incoincidence with mark 21,, marks (1, 2, or 3) will be close to mark 31, so that the actuating member 4 is now turned slightly and one of. the horizontal lines 34. (1, 2, or 3): coincideswithmark 31 (Fig. '7) (dependent upon thenumber of'additional lines, that is one or twov or three, etc. it. is desired to type, after the -mechani.cal locking of the platen and subsequent manual'unlocking of the-same, and before the paper becomes loose from the said platen). The member 5 is.n0w engaged Withthe member 4 by rotating. the member 5slightly so that thepin I]; engages in. one of the perforations 29 after which the platen is turned; back so thatth paper is brought in position to start the first typing line,-which also movesring 3 with its pointer to the'lefi' Fig; 7-, a distance relative depending upon the-length of the paper.

As the typing. progresses on down thesheet of paper and upon each line. spacing andreturn movement of the carriage of the typewriter the shaft 2-8 isturnedlslightly' togetherwith the stub shaft 8, coupling memberi', and actuating member'l together with the threaded portion IS, the latter causing agradual and intermittent axial movement of thering 3 tothe right since the latter is fixed. against. rotation due to the slot 22 and the pin 2|. When the bottom edge of sheet is again in front of mark 35 (Fig. 9) the pointer will again be facin markl'l and the lock ring 3 will; be; separated; from the head: of the screw actuating member 4, by .a distance so established thatsaid screw will be locked, and-consequently the platen, one, .twOQthree or more lines (ac: cording to how the locking mechanism was set by the operator) before the point where the sheet is released from the platen, in as much as the bot-: tom edge-of the sheet, starting from point 35 (Fig. 9) covers a :determined distance which terminates at the point where the sheet is re leased from the platen, this distance cooperating with the distance the ring 3 has to cover starting from the position when the pointer 24 coincides with mark 21 to that in which it encounters the head of the screw'actuating member 4.

The operator is thus warned that only one, two, three, etc. lines (according tothe settlingof the locking device, when coupling it) can be written, when he unlocks theplaten, before the sheet is released from the platen thus assuring a margin of the desired Width at the bottom of the sheet. It is easily understood that markings on the actuating screw member. 4 need not be limited to 1, 2, 3 but may. be in greater number so that the operator will have a wider range of choice in determining the lines still to remain at his disposal. It is also clear that the'device will operate with the-utmost precision regardless of the length of the sheet in use or of the place where typing is commenced, conditions which are rendered immaterial to the operation of the device by the fact that markings 31,21, 1, 2, 3 are established with regard to a determined initial position of the bottom edge of the sheet.

Thus to summarize the method of operation of the device, the knob member 5 is-moved to the right and locked in the head groove 33 so that the platen may rotate freely, without causing the rotation of the screw actuating member 4 the paper is then inserted in the platen in the usual manner and the latter i turned until the bottom edge of the sheet coincides with the reference mark 35 (Fig. 9) the screwractuating member is then turned by hand until the pointer 24 is facing mark 21, then the coupling member 5 is returned to the left to its original position with a pin I! in a perforationZQ- andthe pin l8 in the groove 32, the platen is rotated back to bring the paper to its first .typing line thus moving the ring 3 and indicator 24. to the left. Finally when the platen cannot be rotated further when the typing is near the bottom of the sheet dueto the locking of the lock ring 3, the typist will know that the typing of the sheet can progress onl if he unlocks the platen. The knob 5 is now pulled to the right, Fig. '7, to unlock the platen so that one, two, three or more lines can-be typed on the sheet as it was preset. It is to be remarked that the essence of this invention rests in the combination of the elements and in the process of relationing the displacements of the bottom'edge of a paper sheet resulting from the rotation of the platen in a typewriter: or the l ke, with the reciprocal displacements of the members of a mechanism operatively connectabl to the platen, and not only in the mechanical arrangement of the said mechanism which may assume any suitable disposition or form. Eifectively, the combination of a determined reference on the carriage or on a fixed part of the typewriter, with which reference the bottom edge of the sheet is initially made to coincide, may be made with any form of mechanism, used for the purpose of warning that the typing of the reached the desired preset point.

Obviously, the present invention is not re.-

paper sheet has the actuating screw 1 2. A lockingdevice for paper-feed rollers acstricted to the particular embodiment :herein shown and described. Furthermore, the invention is capable .of many "variations without departing from the spirit of theinvention asset forth inthe app ndedclaims' 7 a 1 .I claim as my invention: T 1.'In alocking device for paper-feed-rollers supported on a: carriage, :arotatable shaft supporting apaper-feed-roller, and extending beyond one-end thereof; ,a stub shaft .secured'coaxially to thesextending end of said rotatable shaft and havinga T-shapedislot near its-outer end; a cylindrical guide member on said stub shaft and fixed against rotation withrespect t0 the carriaga said guide'member having a lon-f gitudinal slot therein; an indicator-lock ring threaded on its inside surface and slidable axially within said guide member; a small screw in the periphery ofthe ring to fix said ring against rotationby cooperation wtih the slot inthe guide member; an "actuating screw :member fixed against, axial movement with respect to said'stub shaftrand rotatably mounted for adjustment on the stub. shaft, said screw member having a threaded portion on its exterior to. engage'the threaded portion of said ring. and having a pin on its outer end; anda coupling membermounted on said stub shaft near its. outer end and having a series of perforations adapted'to cooperate with the pin, said couplingmember having a pin extending into the T -shaped slot of said stub shaft and forming a positive drive after adjustment of member.

cording .to claim 1, in which the coupling member and its pin are mounted forlimited translational and rotational movements with respect to the stub shaft to disconnect the actuating screw member from the said stub shaft. V V

3. A locking device for paper-feed-rollers according to claim 1, in which the couplingmeniber is mounted for axial movement relative to the said stub shaft and is provided with means to urge it into driving engagement with the actuating screw membensaid coupling member. at one end of such-movement being capable of partial rotation withrespect to said stubshaft and at theother end of such movement being operatively connected to the actuating screw member.

4. Thecombination with the platen of typewriting machines, tabulating machines andthie like, and a guide mark on an unrotatable. part of the machine, 0f an adjustable mechanism mounted ona shaft of the platen and adapted Q toautomatically lock said platen against rotation determined by adjusting said mechanism to the guide markwith the bottoinedgeof the sheet to be typed overthe said mark and before typing on the sheetto maintain a predeteitmined bottom margin on the typed sheet. t i ,7 5. A locking device for the platens of typewriting machines and the like in whichthe machine is provided with areference mark for the bottom edge of the sheet to be typed, comprising cooperating fixed and movable parts mounted on aplaten carriage andplaten respectively and the parts havingreference marks thereon so that the locking mechanism maybe set with respect to the bottom-edge ofthe sheet to be typed incorrespondence with the said reference mark on. the

machine to effect a locking of the platen against rotation when apredeterminedpoint on the bottom of the sheet is reached, after-the typing operationflto'thus leave a predetermined bottommargin on thesheet. ;i 1

6; In a device for providing: a..- predetermined margin at the bottom; ofi typewritten sheets ina typewriter and the"like, the combination of'la platen and a fixedireference mark'on'the typewriter, in cooperationiwiththe platen-to set the bottom edge of the sheetto be typed-in alignment with said mark, and a lockingimechanism' conn'ectedto the platen and which is adjustable so that said mechanism can'be set relative to the bottom e'dges of the-sheet in 'alignment with. the reference mark whereby when "the sheet i is typed the: mechanism will lock the platen against further rotation ata predetermined moment before thebottom edge of the sheet is reached to thereby leave: a predetermined margin I at the :bottom of thetyped sheet. 11

T. In a device for providing a predetermined margin at the bottom of typewritten sheets in a typewriter and the like,'the combination of a platen and a fixed referencezmark on: the typewriter, in cooperation with the platen to set the bottom edge 01'- the 'sheet'to-be'typed in-alignment with said mark, a'locking mechanism-connected' to the platen and which is ad justableso that said mechanism can be set relative to the bottom edge o'f'the sheet in alignment with the reference mark whereby whenthe sheet is typed the mechanism willlockthe'platen against'furf ther rotation at a predetermined moment before the bottomed'ge of the sheet is reached to thereby leave apredetermined' margin at the bottom of the typed sheet, and fixed and movableparts having reference marks thereon to permit the typing of at least one additional line on the sheet from the preset position" where the mechanism actually locks the platen against rotationand before'the sheet become's loose from the-platen. 1

8. Ina device for providing a predetermined marginat the bottom of typewritten sheets in a typewriter and'the like, the" combination of a platen and 'a fixed reference mark on the typewriter, in cooperation with the platen to set the bottom edg'e' ofthe sheet to be typed in alignment' with said; mark, a locking mechanism connected to the platen an'dwhichis adjustable so that said mechanism cam-be' setfrelative to the bottomedge of the sheet in alignment with, the reference mark whereby whenthe sheet is typed the mechanism will lock the platen against further rotation at a predetermined'mo'ment before the bottom edge of the "sheet is reached to thereby leave "a predetermined margin at the bottom of the typed sheet, fixed and movable parts having reference marks thereon, and a pointer cooper+ atingwith the reference mark on the fixed part to permit the typing of atleast one additional lineon the sheetfrom the preset position where .the mechanism actually looks the platen against rotation and before the sheet becomes loose i from the platen.

V 9. A locking mechanism' fora platen oftypewriting machines and the, liketo providea pre determined bottom margin on the sheet to be typed, comprising an actuating screw member having 'a screw-threaded portion and rotatably mountedfor adjustment on'ashaft of the platen,

aguide member securely mounted on a carriage of the platen and extending over the screwthreaded portion of the screw member, 'said'guide member having a longitudinal slot therein, a lock 7 ring engaging the screw-threaded portion and having. a. portion projecting into the slot; and

means for coupling the actuating screw member 1 withr'the platen shaft whereby when an abutment surface on the locking ring meets a: cooperating abutmentsurface formed upon the actuating screw member, the said'i lock'ring will lock the platen against further: rotation.

10; A locking mechanism: according to claim 9; in which the means for coupling the actuating member'is in the-form of a turning knob for the platen which 'lastmay'be coupled and uncoupled: with the locking mechanism but always remains coupled with the said turning knob.-

A locking mechanism according to claim 9; in which the actuating screw member is provided with'a lateral projecting pin, and in which the coupling-means is inthe form of an axially adjustable turning knob. slidably mounted on theshaft and 'having ai-plurality 'ofcircumferentially arranged perforations in a side face thereof to cooperate with the projecting pin-in the screw member'to couple the'screw member with the turning knob and the. platen shaft.

, 12. Alocking mechanism for the platen of a typewriterand the like to leave apredetermined bottom marginaon the sheet. to be typed, comprising a stub shaft securely mounted on an axle of the platen, an' actuating' screw memher having ascrew threaded portion and rotatably mounted for adjustment on the stub shaft, 2. guide member securely mounted on a carriage of the platen and extending over the screwthreaded portion of' the screwmember, said guide member having a longitudinal" slottherein, a .lock ring engaging the screw threaded. portion and having a: portion projecting into the slot, and aturning knob member slidably" and rotatably mounted for limited movements on said stubshaft, said' knob member and: actuating screw member having means to couple and uncouple the actuating screw*member' from the stub shaft and when coupled the rotation of the platen promotes the axial displacement of the lock ringso that the platen will be locked against rotary motion when a radial abutment surface on the lock 'rin'g meetsaa cooperating abutment surface: formed upon the actuating screw member;. I 1 I 13. A locking mechanism according to claim 12, in' which the stub shaft is provided with 'acircumferential groove and a T-shaped groove, and of which the actuating screw member is providedwith means projecting into the circum' ferential'groove to permit rotary motion of the actuating screw member but prevent axial movement thereof relative to the stub shaft, and the knob member has means thereon projecting into the T-shaped groove to permit limited rotary and axial movement of the turning knob relative to the stub shaft.

1 14. A locking'mechanism according to claim '12, in which the course of. thelock ring isposi- 'tively limited in either direction along the actuating screw member by its location between a radial abutment surface at one end of the. screw member and a nut securedupon the opposite end of the screw-threaded portion" of thescrew member whereby helocking mechanism is capable of operation in either directionlof rotation.-

15. A locking mechanism according to claim 12, in which a ring presenting a seriesv of numbered referencemarks is adapted to the screw actuating member in such a'posit'ion that the said references may cooperate with a fixed reference mark on the guiding member, and in which an-adjustable plate supporting a reference coop era-ting with an indicator pointer on the lock ring: nut is adjustable to=the guide member in such a position as to permit the cooperation of the reference with said pointer, whereby said reference marks on the ring and plate may easily be adjusted in a position cooperating with a third reference mark on a unrotatable part of the typewriter and the like, with which latter mark the bottom edge of the sheet is made to coincide at the moment of coupling the locking mechanism to the platen.

16. In a typewriter or the like having a platen with an axle, the combination with a guide mark in the path of motion of a sheet inserted into the typewriter and on a fixed portion of the typewriter, of a mechanism mounted on the axle for locking the platen against rotation, said mechanism comprising means for setting the same in adjusted position relative to the bottomedge of v-5 the sheet to be typed when inregister with the guide mark, and said mechanism also including means to'lock the platen against further rotation after a predetermined number of revolutions of the platen when .the sheet has been typed to thereby leave a predetermined preset bottom margin on the typed sheet.

17. A device according to claim 16, in which the two means includes a pair of non-rotatable members, and a pair of rotatable members mounted with a stub shaft securely mounted on the axle, one of said rotatable members having one of the non-rotatable members mounted thereon in axial adjustable relationship relative to each other. 1

J OSE FIGUEIRA SABOIA DE ALBUQUERQUE. 

